Flounder or winter flounder are known commercially as blackback flounder or lemon sole. They are a flatfish similar to fluke or summer flounder. The most noticeable difference is that fluke have a large mouth with teeth to catch and eat bait fish, while flounder have a small mouth with lips and no teeth to eat marine worms and tiny shrimp.

They inhabit sandy or muddy bottom in depths from just a few feet to over 300 feet from Southern New Jersey to Nova Scotia. Best baits are clams, mussels and worms.